Airworthiness directives › 2011-23-03
AD 2011-23-03 Airworthiness Directives; SOCATA Airplanes
Makes named: socata. Models named: TBM 700. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
This AD applies to SOCATA Model TBM 700 airplanes, serial numbers 148, 434 through 572, 574, and 576, certificated in any category.
Compliance
Unless already done, within 6 months after December 6, 2011 (the effective date of this AD), install a protection fuse on the wire at the standby compass connector following the Accomplishment Instructions in DAHER-SOCATA TBM Aircraft Mandatory Service Bulletin SB 70-192-34, dated April 2011.
Required actions
Note: This AD differs from the MCAI and/or service information as follows: No differences.
Unsafe condition
The mandatory continuing airworthiness information (MCAI) states: A TBM700 operator reported an occurrence where, as a result of handling the standby compass lighting bulb cover in flight, both essential bus bars (ESS BUS 1 and ESS BUS 2) failed, leading to loss of a number of instruments and navigation systems. The technical investigations carried out by SOCATA have shown that the cause of this occurrence was that the electrical protection of some TBM 700 aeroplanes is insufficient to allow in-flight handling of the standby compass lighting cover when energized. This condition, if not corrected, may compromise the ability of the pilot to safely operate the aeroplane under certain flight conditions due to the increase of workload. To address this unsafe condition, SOCATA have developed a modification which consists of installing a protection fuse on the wire at the standby compass connector, introduced by SOCATA Service Bulletin (SB) 70-192-34. For the reasons described above, this AD requires installation of a protection of the electrical wire at the standby compass connector.
Affected ADs
None.
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